Circuit for protecting electrical apparatuses from short...

Details Circuit for protecting electrical apparatuses from short... Circuit for protecting electrical apparatuses from short...

H - Electricity

02

H

317/11

H02H 3/08 (2006.01)

Patent

CA 1129488

ABSTRACT OF THE DISCLOSURE The invention relates to a circuit for protecting electrical apparatuses from short circuit or overload faults. The circuit includes an inductively coupled signal pick up for a single phase or for each phase. A first zenor diode is adapted to receive a signal voltage from the signal pick up and is in an actuated state only when the current to the apparatus exceeds a first predetermined limit. The first zenor diode is connected to a switching circuit. A second zenor diode is adapted to receive a signal voltage from the inductively coupled signal pick up and is in an actuated state only when the current to the apparatus exceeds a second pre- determined limit which is lower than that of said first level. The second zenor diode is connected to the switching circuit through a time delay circuit to provide a delay in the actuation of the switching circuit.

305928

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